细胞色素P4501A1基因多态性与肺癌遗传易感性的研究

Genetic Polymorphisms of CYP1A1 and Susceptibility of Lung Cancer

目的探讨细胞色素Ｐ４５０１Ａ１（ＣＹＰ１Ａ１）ＭｓｐⅠ基因型和异亮氨酸（Ｉｌｅ）－缬氨酸（Ｖａｌ）基因型与肺癌易感性的关系。方法以病例－对照的研究方法，采用ＰＣＲ－ＲＦＬＰ和ＡＳＡ技术检测５９例原发性肺癌、５９名住院对照和７３名健康对照ＣＹＰ１Ａ１ＭｓｐⅠ和Ｉｌｅ－Ｖａｌ基因型。结果ＭｓｐⅠ纯合突变型Ｃ和缬氨酸纯合型（Ｖａｌ／Ｖａｌ）在病例组各占２５．４％和１１．９％，对照组中平均各占１６．５％和７．０％，相比较无显著性差异（Ｐ＞０．０５）。未发现吸烟与ＭｓｐⅠＣ型和Ｖａｌ／Ｖａｌ型有关。在非吸烟组ＭｓｐⅠＣ型者患肺癌的危险性（ＯＲ）是其他基因型的２．４３～２．９１倍（９５％可信限：１．１２～５．２５和１．１３～７．５２），ＭｓｐⅠ杂合型Ｂ在健康对照和病例组分别占６１．６％和３７．３％（Ｐ＜０．０１），ＯＲ为０．３７（９５％可信限：０．１７～０．８０）。Ｉｌｅ／Ｖａｌ杂合型在医院对照组占８１．４％，病例组为５５．９％，差异极显著（Ｐ＜０．０１），ＯＲ为０．２９（９５％可信限：０．１２～０．７２）。有家族肿瘤史的肺癌Ｖａｌ／Ｖａｌ型占５０％（３／６），显著高于对照组（０／１８），Ｐ＜０．０１。结论ＭｓｐⅠＣ型?

Objective To assess the possible association between the polymorphisms of CYP1A1 and the susceptibility of lung cancer so as to provide clues for genetic markers of lung cancer. Methods CYP1A1 rare genotypes MspⅠ C and VV were detected with the methods of PCR RFLP and ASA in a case control study including 59 cases of lung cancer, 59 hospital controls and 73 healthy controls. ResultsThe frequencies of rare genotypes C and VV of the lung cancer cases were not significantly different from those of the controls, though the frequency of C(25.4%) of the lung cancer cases was higher than that (16.5%) of the controls. However, in the non smoking group with genotype C, the risk of lung cancers was 2.43 2.91 times greater than that of the controls. Heterozygote B was overpresented in healthy controls (61.6%), compared to that of lung cancer cases (37.3%), P<0 01 , odds ratio 0.37(95% confidence interval 0.17 0.80). Conclusion Genotype C may be one of the susceptibly genetic markers of lung cancer in the non smoking population. The risk of lung cancer can be decreased in persons with heterozygote.